研究目的
Investigating the ultrafast optical switching capabilities of a nonlinear optical loop mirror (NOLM) over the entire C-band for error-free demultiplexing of 320 Gbaud OTDM signals.
研究成果
The NOLM demonstrated ultrafast optical switching with a gate width of 650 fs over the full C-band, enabling error-free demultiplexing of 320 Gbaud DQPSK signals. This technology has potential applications in ultrafast optical networks and signal processing.
研究不足
The shorter wavelength suffers from a larger power penalty due to OSNR degradation caused by lower gain of the EDFA.
1：Experimental Design and Method Selection:
The experiment utilized a NOLM with a 20-m dispersion-flattened highly nonlinear fiber (HNLF) for ultrafast optical switching.
2：Sample Selection and Data Sources:
A 320 Gbaud DQPSK signal was generated and demultiplexed to 40 Gbaud.
3：List of Experimental Equipment and Materials:
Included a tunable laser diode, optical comb generator, IQ modulator, EDFA, pulse shaper, and a 40 GHz mode-locked fiber laser (MLFL).
4：Experimental Procedures and Operational Workflow:
The signal was shaped into a Nyquist pulse, demultiplexed using the NOLM, and then demodulated.
5：Data Analysis Methods:
BER measurements were conducted to evaluate performance.
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tunable laser diode
Generating the CW output for the optical comb generator.
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optical comb generator
Generating optical comb from the CW laser output.
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IQ modulator
Modulating the optical signal to generate a DQPSK signal.
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EDFA
Amplifying the optical signal.
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pulse shaper
Shaping the signal into a Nyquist pulse.
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mode-locked fiber laser
MLFL
Generating control pulses for the NOLM.
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HNLF
Used in the NOLM for low walk-off operation.
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WDM coupler
Coupling the control pulses into the NOLM.
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balanced photo diode
PD
Detecting the demultiplexed signal.
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